fix: Apply correlation filter to handlers for proper multi-logger support

Fixes logging errors during app initialization and in background threads.
The correlation_id filter must be applied to handlers (not just loggers)
to ensure all log records have the correlation_id attribute before
formatting occurs.

Issue: Gunicorn workers were crashing due to missing correlation_id
in logs from memory monitor and other non-request contexts.

starpunk/__init__.py

@@ -65,16 +65,8 @@ def configure_logging(app):
             datefmt="%Y-%m-%d %H:%M:%S"
         )
 
-    console_handler.setFormatter(formatter)
-    file_handler.setFormatter(formatter)
-
-    # Remove existing handlers and add our configured handlers
-    app.logger.handlers.clear()
-    app.logger.addHandler(console_handler)
-    app.logger.addHandler(file_handler)
-
-    # Add filter to inject correlation ID
-    # This filter will be added to ALL loggers to ensure consistency
+    # Add filter to inject correlation ID BEFORE setting formatters
+    # This filter must be applied to handlers to work with all loggers
     class CorrelationIdFilter(logging.Filter):
         def filter(self, record):
             # Get correlation ID from Flask's g object, or use fallback
@@ -90,11 +82,21 @@ def configure_logging(app):
                     record.correlation_id = 'init'
             return True
 
-    # Apply filter to Flask's app logger
     correlation_filter = CorrelationIdFilter()
-    app.logger.addFilter(correlation_filter)
 
-    # Also apply to the root logger to catch all logging calls
+    # Apply filter to handlers (not loggers) to ensure all log records have correlation_id
+    console_handler.addFilter(correlation_filter)
+    file_handler.addFilter(correlation_filter)
+
+    console_handler.setFormatter(formatter)
+    file_handler.setFormatter(formatter)
+
+    # Remove existing handlers and add our configured handlers
+    app.logger.handlers.clear()
+    app.logger.addHandler(console_handler)
+    app.logger.addHandler(file_handler)
+
+    # Also apply filter to root logger for any other loggers
     root_logger = logging.getLogger()
     root_logger.addFilter(correlation_filter)